Hello Nguyenjs. Most of the sealant materials for sealing leaky boats are meant to be applied from the inside of the boat, as they don't have UV protection (so painting the hull would likely be needed then). Personally, I suggest doing this the right way and sealing from the inside of the hull, or re-bucking the rivets (or replacing works too!) and then applying sealant. It is important to do this the right way now rather than investing time and money to only find out that your boat looks fantastic with new flooring and carpet but is still leaking.
Just my 2 cents worth! Great pics for explaining your boat issue!
Frey
Thanks for the response. It is indeed a lot of work to take all the compartments out and a much longer project I anticipated. The rivets on the hull are not like the ones of seen used on the inside. It looks like steel type rivets, but and I don't have the tools to take them out or know where to get the replacements.